14804-39-8Relevant articles and documents
Medium-Sized Cyclophanes. 43. First Evidence for anti-syn-Ring Inversion under the Nitration of 5,13-Di-tert-butyl-8,16-dimethoxy[2.2]metacyclophane
Yamato, Takehiko,Kamimura, Hideo,Furukawa, Tsuyoshi
, p. 7560 - 7564 (1997)
Nitration of 5,13-di-tert-butyl-8,16-dimethoxy[2.2]MCP (metacyclophane = MCP) (1) with various nitrating reagents led to ipso-nitration at the tert-butyl group to give 5-tert-butyl-8,16-dimethoxy-13-nitro[2.2]MCP (2), as well as the corresponding 8,16-epo
A Mild Heteroatom (O -, N -, and S -) Methylation Protocol Using Trimethyl Phosphate (TMP)-Ca(OH) 2Combination
Tang, Yu,Yu, Biao
, (2022/03/27)
A mild heteroatom methylation protocol using trimethyl phosphate (TMP)-Ca(OH)2combination has been developed, which proceeds in DMF, or water, or under neat conditions, at 80 °C or at room temperature. A series of O-, N-, and S-nucleophiles, including phenols, sulfonamides, N-heterocycles, such as 9H-carbazole, indole derivatives, and 1,8-naphthalimide, and aryl/alkyl thiols, are suitable substrates for this protocol. The high efficiency, operational simplicity, scalability, cost-efficiency, and environmentally friendly nature of this protocol make it an attractive alternative to the conventional base-promoted heteroatom methylation procedures.
Pd-Catalyzed ipso, meta-Dimethylation of ortho-Substituted Iodoarenes via a Base-Controlled C-H Activation Cascade with Dimethyl Carbonate as the Methyl Source
Wu, Zhuo,Wei, Feng,Wan, Bin,Zhang, Yanghui
supporting information, p. 4524 - 4530 (2021/05/04)
A methyl group can have a profound impact on the pharmacological properties of organic molecules. Hence, developing methylation methods and methylating reagents is essential in medicinal chemistry. We report a palladium-catalyzed dimethylation reaction of ortho-substituted iodoarenes using dimethyl carbonate as a methyl source. In the presence of K2CO3 as a base, iodoarenes are dimethylated at the ipso- and meta-positions of the iodo group, which represents a novel strategy for meta-C-H methylation. With KOAc as the base, subsequent oxidative C(sp3)-H/C(sp3)-H coupling occurs; in this case, the overall transformation achieves triple C-H activation to form three new C-C bonds. These reactions allow expedient access to 2,6-dimethylated phenols, 2,3-dihydrobenzofurans, and indanes, which are ubiquitous structural motifs and essential synthetic intermediates of biologically and pharmacologically active compounds.
Palladium-Catalyzed 4-Fold Domino Reaction for the Synthesis of a Polymeric Double Switch
Khan, Taukeer A.,Fornefeld, Torsten,Hübner, Dennis,Vana, Philipp,Tietze, Lutz F.
supporting information, p. 2007 - 2010 (2018/04/16)
A palladium-catalyzed 4-fold domino reaction consisting of two carbopalladation reactions and two C-H activation reactions, followed by the introduction of an acrylate moiety, led to the tetra-substituted helical alkene A2, using the dialkyne A3 as a subs